Know the moment any of your IPs or domains appear on a blocklist. Get alerts with context and removal instructions before your email deliverability takes a hit.
Start Monitoring FreeFree plan available No credit card required Add your first host in under 2 minutes
Checks against hundreds of RBL and URIBL sources, plus premium threat intelligence feeds. If a mail filter uses it, we check against it.
Alerts within minutes of a new listing via email, SMS, Slack, Discord, PagerDuty, webhooks, and more. Notified when you are cleared too.
Monitor IP addresses, ranges, CIDR blocks, and domains together. Add hosts manually, via CSV, or through the REST API.
Monthly plans for predictable costs. Pay-per-check for unlimited scale.
Not ready to commit? The free plan monitors 1 host indefinitely. Sign up free, no credit card required.
"We used to find out about blacklistings from customers reporting bounced mail. Now we know within minutes and we're delisting before anyone notices."
"Managing thousands of sending IPs across multiple mail streams, this is the only way to know which ones are causing deliverability problems before they show up as support tickets."
Yes. One host, monitored indefinitely. No trial period, no expiration, no credit card required.
Under two minutes. Create an account, add a host, and monitoring starts on the next check cycle.
No. Everything runs on our infrastructure. Notification integrations like Slack, PagerDuty, and webhooks are optional add-ons.
Start monitoring in minutes. Free plan available, no credit card required.
Start Monitoring Free